More Thumb2 32-bit opcode support:

	 A5.3.10 Store single data item 

Byte, word, halfword.  Offset, pre-index, post-index.  And
a "make like you're unprivileged" option when using small
immediate offsets.


git-svn-id: svn://svn.berlios.de/openocd/trunk@2537 b42882b7-edfa-0310-969c-e2dbd0fdcd60